One of my older neighbors, he just had a 23kw Generac, transfer switch, concrete pad, buried propane line, etc.
(Already had propane tank for gas logs)
Counting his install, whole thing was $9,000
He’s in his 70s just had his knees replaced so he is/was in no shape to DIY or bargain.
I thought it was high
-because:
Me and him both were pricing 18-20 kw units about 4 years ago installed by our local natural gas utility for $5500-6000.
His $9,000 guy was a private outfit as our utility no longer offers the generator packages.
9k$ For that size gen set with complete, turn key installation sounds about right for our area.